Metallic packing for piston-rods.



No. 807,294. PATENTED DBC. l2, 1905. J. H. LEWIS & L. G. KUNZER.METALLIC PACKING POR PISTON RODS.

APPLICATION IILBD JULY 24, 1905.

IINITED STATES PATENT OFFICE.

JOHN H. LEWIS AND LOUIS G. KUNZER, OF CHICAGO, ILLINOIS.

METALLIC PACKING FOR PlSTON-RODS.

Specification of Letters Patent.

Patented Dec. 12, 1905.

Application iiled July 24:, 1905. Serial No. 270,961.

T0 all whom t may concern: I

Be it known that we, JOHN H. LEWIS and Louis G. KUNZER, citizens of theUnited States, residing in Chicago, in the county of Cook and State ofIllinois, have invented anew and useful Improvement in Metallic Packingfor Piston-Rods, of which the following is a specification.

Our invention relates to improvements in metallic packings forpiston-rods, and more especially to improvements upon the metallicpiston-rod packing forming the subject of our Patents Nos. 721,709 and721,710, granted March 3, 1903n In the metallic packing of our saidprior patents, Nos. 721,709 and 721,710, the outer leaf or member of'each segment was furnished with a narrow or tapering edge abuttingdirectly against a corresponding shoulder on the adjacent segment, theedge of said outer leaf being tapered to allow for contraction of thepacking to compensate for wear, while at the same time forming a closecontact-joint, and sometimes difculties arise in practical operation,owing to the segment bearing this outer leaf being moved outward by thesteam-pressure until this tapering edge slips over its meeting shoulderof the adjacent segment, and thus preventing this end of the segmentbearing the overlapping leaf from returning to its normal position, andthus occasioning leakage.

The object of our present improvement is to provide a means forovercoming this occasional diHiculty or defect in the practicaloperation of our patented metallic piston-rod packing.

` Our present invention consists in the means we employ to 'practicallyaccomplish this object or result-that is to say, it consists in ametallic packing comprising a plurality of segments, preferably four innumber, each halved, notched, or oifset in two planes transversely toeach other, forming overlapping leaves or members, and three transversepartial joints at the meeting ends of each two adjacent segments, eachof which joints extends only part way through the metallic packing-ringas a whole, each partial joint coming at a different point of thecircumference from the others, so that the several partial joints breakjoints with each other, each of the segments having an internal narrowor compressible finger or member abutting directly against a shoulder onits adjacent segment and fitting inside the outer movable leaf or memberof such adjacent segment, so that the narrow or compression membercannot spring or move outward and overlap its abutting shoulder on theother segment, and thus occasion leakage in the packing or defectiveoperation.

Our invention further consists in the novel construction of parts anddevices and in the novel combination of parts and devices herein shownand described.

In the accompanying drawings, forming a part of this specification,Figure 1 is a longitudinal vertical section showing a portion of acylinder-head and piston-rod furnished with a metallic packing embodyingour invention. Fig. 2 is a section on line 2 2 of Fig. l, showing thepacking-ring in elevation. Fig. 3 is a face view of the packing-ringlooking from the opposite side thereof which is shown in Fig. 2. Fig. 4is a detail perspective view showing one of the segments of the metallicpacking-ring, and Fig. 5 is a perspective view of one of the segments ofthe packing-ring looking from the opposite side to that shown in Fig.4f.

In the drawings, A represents a piston-rod, and B a portion of thecylinder-head, of a locomotive, through which the piston-rodreciprocates, our invention being specially designed for use as apacking for locomotive piston-rods, though applicable to other purposes.

D is the packing gland or collar, which is secured to the cylinder-headB by bolts D', the packing gland or collar being preferably divided ormade in two parts for convenience of application around the piston-rod,especially in cases where the piston-rod is formed With an enlargement.The packing gland or collar D is furnished with one or more interiorannular grooves or recesses d to receive the segmental metallicpacking-rings F, according as it is desired to employ one or moremetallic packing-rings for the piston.

Our improved metallic packing-ring comprises a plurality of segments F,preferably four in number, each of which isr halved, notched, or offsetin two planes, one being parallel to the circumference of the piston orpacking-ring and the other plane of division being at right angles tothe piston and forming overlappingleaves or members, and threeradially-extending partial joints,each of which radial joints, however,extends only part way across or through the packing-ring. The segments Fare all exactly alike, and each thus has at one end an inner leaf ormember f and IOO IIO

at its opposite end an outer leaf or member f', which overlaps the innerleaf or member f of the adjacent or meeting segment. Each of thesegments F also has its inner leaf or 5 member f provided with a sideleaf or member f2 and at its opposite end with a side member f3. whichoverlaps the corresponding side leaf or member f2 on the end of theadjacent or meeting segment., Each of the segments IO F has a peripheralnotch f* at one end to receive the overlapping leaf or member f on theadjacent or abutting segment and with an interior partial notch f5half-way through the thickness of the segment to receive the side I5leaf f2 on the inner leaf f of the adjacent or abutting segment. Theshoulder f of the notch f4 and the end f7 of the outer leaf f of twoadjacent segments thus form one partial radial joint fs through thepacking-ring, 2O this joint extending through the whole thickness of thering, but only partially through the ring radially. rlhe adjacentshoulders f9 of the inner leaff and flo of the inner leaf f3 thus formanother partial radial jointfu, this 2.5 joint extending only half-waythrough the thickness of the packing-ring as a whole and also only partway through the packing-ring radially, and the adjacent shoulders fu andf13 also form another partial radial joint f, which likewise extendsonly partially through the packing-ring as a whole radially and onlypart way through the thickness of the packing-ring, and the severalpartial joints ffu, and f14 comeat different points of the circumferenceor break joints with each other. The inner leaf or member f of eachsegment E is furnished with a narrow or compression finger f 15, theextreme edge of which abuts snugly against the radial shoulder f 10 ofthe next adjacent segment, thus forming a tight joint therewith, whileat the same time permitting compression or upsetting of this narrowlinger, and thus compensate for wear and permit the segments to contractor come together as the inner periphery of the packingring wears away bythe reciprocation of the piston. All the segments F are furnished with aperipherally-.extending groove f 17 to receive a coil-spring ring whichsurrounds the segmental metallic packing-ring as a whole and serves tohold the segments together.

The packing gland or collar D isprovided with one or more,preferablyfour, small openings CZ for admitting steam into the annular 55 groove d, so that the steam-pressure will lirmly compress the segmentsof the packing-ring around the piston and form a tight joint in caseswhere, as illustrated in the drawings, the packing gland or collar D isprovided with two or more recesses CZ and two or more packing-rings F.Each succeeding packing-ring groove d is provided with steam-inletopenings d, s o that the steam escaping through the preceding packingmay enter and cornpress the succeeding packing.

The segments or parts of the packing-gland D are secured together bybolts cl2. A packing d3, of wire or other suitable material, isinterposed between the packing gland or collar D and the cylinder-headB. Space is left between the meeting end faces or shoulders of theseveral overlapping leaves or members of the adjacent segments F of thepacking-ring to allow for wear and contraction of the packing, thenarrow compression-finger f1 on the inner leaf or member of each segmentupsetting or compressing to permit of this contracting movement of thesegments in respect to each other. This narrowcompression-linger is madecomparatively narrow or thin to permit of its proper upsetting orcompressing under action of the steam-pressure on the packing-ring asthe packing wears away, so that the packing-ring as a whole will alwaysmaintain a tight close fit about the piston.

We claim- 1. A metallic packing for piston-rods comprising a pluralityof segments offset, halved or notched together at their meeting ends intwo different planes or directions,and forming three joints at differentpoints of the circumference, one joint extending' radially through theouter portion of the ring and the other two extending only part waythrough the inner portion of the ring, the inner leaf on each segmenthaving a thin or narrow compression-finger overlapped by the outer leafof the adjacent segment, and adapted to upset or be conipressed topermit the segments to contract or come together to compensate for wear,substantially as specified.

2. A metallic piston-rod packing comprising a plurality of segmentshaving each at their meeting ends double notches or offsets formingoverlapping leaves or members, and three joints at different points ofthe circumference, one of which extends only through the outer portionof the packing-ring, and the other two of which extend each only partway through the inner portion of the packing-ring, the inner leaf ormember of each segment being provided with a compression-finger abuttingagainst a radial shoulder of the adjacent segment and being overlappedby the outer leaf or member of such adjacent segment, saidcompression-fingerA yielding or upsetting to permit contraction of thesegments and compensate for wear, substantially as specified.

3. Ametallic packing comprising a plurality of segments having at theirmeeting ends double notches or offsets in different planes formingoverlapping leaves, and three joints at different points of thecircumference, one of which extends only through one portion of theradial thickness of the packing-ring, and the other two of which jointsextend each only part way through the other portion of the radialthickness of the packing-ring, said segments being furnished on theirinner leaves or members with a compression finger or mem- IOO IIS

ber overlapped by the outer leaf or member of the adjacent segment andserving by its 5. A metallic packing comprising a plurality of segmentshaving overlapping leaves or members at their meeting ends forming threepartial radial joints, the inner leaf or member of each segment having anarrow compression-finger yielding or upsetting to permit contraction ofthe segments and compensation 2O for Wear, substantially as speciiied.

` JOHN H. LEWIS.

LOUIS G. KUNZER.

Witnesses:

PEARL ABRAMS, H. M. MUNDAY.

